Reamer



atented February 16, 1904.

PATENT OFFICE.

LEROY wEn'rs, or MILEoED, MISSOURI.

FIEAIVIER.v

SPECIFICATION forming part of Letters Patent No. 752,494, datedFebruarylG, 1904. Al-)plicationfiled February 2, 1903. Serial No.141,557. (No muiiel.)

To all whom it may concern/.1

Be it Vknown that I, LEROY VVnRTs, a citizen of the United States,residing at Milford, in the county of Barton and State of Missouri, haveinvented new and useful Improvements in Reamers, of which the followingis a-speci fication.

My invention relates to a reamer for enlarging the ends or any otherportion of blasting-holes drilled in coal-mines. The object of reamingsuch holesV to larger diameter is to permit the miner to bed Vthe powder(or dynamite) all in a bunch and to give the powder a shoulder, so tospeak, to push against in exploding, the effect of which is that withrearned holes a given quantity of powder will do more execution than inthe usual holes having uniform diameters.

Referring now'to the drawings, Figure 1 is a partly-sectional elevationof a reamer embodying my inver tion, the cutters being separated, thecoal or other material in section, the stand in section, and the tubularscrew partly in section. Fig. 2 is an enlarged longitudinal sectionalview of two portions of the tubular shank, two portions of the rod 14,`

and a portion of the rod 16. Figf is' an end elevationof the cutters andthe guide-piece in which they are mounted. Fig. 4 is a longitudinalsection, on the same scale as Fig. 3, of the cutter-guide and a portionof the tubular shank, showing also the wedge and a portion of its rod,the cutters being for clearness omitted. I

Fig. 1 represents one of my reamers embedded in a hole which haspreviously been drilled in the coal by a coal-drill. 1- and 1 are thecutters by which the reaming is done. These cutters are arranged side byside in a longitudinal slot 3 of a casting or forging4, termedhereinafter the cutter-guide. The inner ends of the cutters 1 arepivoted, respectively, on pins 6 and 6, which are securedin thecutter-guide 4 across the slot 3. The ends of the cutters project beyondthe end of the cutter-guide, and the outer edges of the cutters may bebeveled or sharpened, asy shown in Fig. 4.' v

The inner end of the cutter-guide 4 is tubular and is rigidly securedupon the end of a tubular shank 7. The opposite end of this shank 7 isdetachably secured to or within the end of a tube 8 provided withexternal screwthreads and referred to hereinafter as the tubular screw.Said tubular screw is mounted in a two-piece boxing 9, which issupported in the usual'manner by a regular coal-drill stand 10, which isnot shown in detail, as its construction is well known in mining. Thedrill with which the blast-hole has been made has been removed from thestand 10 and the tubular screw 8 has been attached in its place. On theouter end of the' tubular screw 8 is secured 1a crank 12, by which saidscrew may be rotated, and thereby advanced, causing the shank 7 and thecutters 1 to advance into the hole.

The inner edges of the cutters 1 are tapered,

as shown, and between said` tapering edgesY lies a metallic cone orwedge 13, which is secured upon the end of a rod 14. This rod 14 extendsthrought a portion of the cutter-guide 4 and back through the tubularshank 7. Its

opposite end is pointed. Another rod 16,

which is. virtually an extension of rod 14, lies within the tubularscrew 8 and projects from the outer end thereof; Acrank 17 is Xed onthis end of said rod, and adjacent to said crank the rod is externallythreaded. The end portion of the tubular screw 8. is internally threadedto engage the threads of rod 16. ,The end of said rod 16 adjacent to thepointed end of rod 14 is recessed to receive said pointed end.

The two rods 14 and 16 are provided instead I of a single rod, so thatwhen the tubular shank 7 is detached from the tubular screw 8 the rod 14may remain within said shank, as will be readily understood. The rod14'is pressed backwardly against rod 16 by an expansionspring 18, whichis confined between a collar 19, secured within the shank 7, and acollar 20, secured upon said rod.

The operation of the reamer is as follows: The rod 16 is retracted byturning its crank 17 far enough to permit the spring 18 to pull back thewedge 13 for the purpose of turning the cutters inwardly, so that theywill not project laterally from their guide 4. The diameter of the guide4 is a little less than that of the average blast-hole-r. e., twoinches.

IOO

The ends of the cutters are inserted in the hole, (after the tubularscrew 8 has been drawn clear back by turning its crank 12,) and the fstand 1.0 is madeV secure in the usual manner.

Then the main crank 12 is turned in the proper direction to advance thecutters l through the hole tothe point desired to be reamed. When such apoint is reached, the other crank, 17, is turned in the proper directionto force the Wedge 13 forward between the cutters. This movementprojects the cutters a suitable distance from theperiphery of the guideLjr-say one-eighth inch. Then the cutters are revolved by turning themain crank 12 until the hole is enlarged, say, one-fourth inch. Then thecutters are further separated or projected by turning crank 17 and againrevolved by turning the main crank 12. Thesev operations arerepeated-until the diameter of the enlarged portion of the hole is aboutfour inches. The Wedge 13 is then withdrawn to its initial position andthe entire apparatus is removed from the hole. Thus a powder-pocket hasbeen Jformed in the hole. The cuttings removed by the cutters may beremoved from this pocket by any suitable means. The ad.-

vantages of forming these pockets have bee stated hereinbefore.

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent. of the United States, is-

The combination with a drill-stand of a tubular screw mounted therein, acrank on one end of said screw, a tubular shank secured to the oppositeend of said screw, a cutter-guide secured to the end of said shank, saidcutterguide having a longitudinal slot therethrough and its inner endtubular, two cutters pivotally mounted within said slot, the edges ofsaid cutters being beveled, a wedge between the inner edges of saidcutters, a rod Vsecured to said wedge and extending through said shankinto the tubular screw and having its upper end drawn to a point, a rodexternally screw-threaded to fit into and pass through the upper end ofthe tubular screw, the said rod being so disposed and constructed thatits lower end will t onto the upper end of the first-mentioned rod.

In testimony whereof I aHX my signature in the presence of twowitnesses.

LEROY wERTs.

Witnesses: C. R. FURRoW,

W. H. DAY.

